›› 2018, Vol. 39 ›› Issue (S1): 341-347.doi: 10.16285/j.rsm.2017.2311

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of long-term mechanical strength of cemented tailings backfill considering effect of filling interval time and solid content

CAO Shuai1, 2, SONG Wei-dong1, 2, XUE Gai-li1,2   

  1. 1. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2017-11-20 Online:2018-07-20 Published:2018-09-02
  • Supported by:

    This work was supported by the National Key R & D Program of China(2017YFC0602901) and Fundamental Research Funds for the Central Universities (FRF-TP-17-075A1).

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Abstract: In order to investigate the influence mechanism of the long-term strength of cemented tailings backfill(CTB) with different filling interval times(FITs) and solid contents(SDs). The uniaxial compression strength(UCS) test was carried out by using two layered CTB specimens with three SDs of 70%, 72% and 75%, four FITs of 12, 24, 36 h and 48 h. And the mechanical properties and its failure forms were investigated. The results show that: (1) The peak compressive strength of CTB decreases with the increases of filling interval. When the FIT is fixed, the UCS value increases along with the SD, and the peak compressive strength and filling interval are polynomial. (2) During the loading process, four stages of the compaction, line elastic, crack propagation and failure development are shown. With the extension of interval time, the failure forms of CTB may represent as the tension failure-shear failure transition-shear mixing damage. The conclusion can provide a useful reference for the strength design and stability control of CTB.

Key words: subsequent backfill, consolidated filling, filling interval time, uniaxial compressive strength(UCS), failure modes

CLC Number: 

  • TD 853

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